1.18. Troubleshooting

Procedure 1.8. Working Around Stale Logical Units

1. Determine which mpath link entries in /etc/lvm/cache/.cache are specific to the stale logical unit. To do this, run the following command:
   ls -l /dev/mpath | grep stale-logical-unit
2. For example, if stale-logical-unit is 3600d0230003414f30000203a7bc41a00, the following results may appear:

   lrwxrwxrwx 1 root root 7 Aug  2 10:33 /3600d0230003414f30000203a7bc41a00 -> ../dm-4
   lrwxrwxrwx 1 root root 7 Aug  2 10:33 /3600d0230003414f30000203a7bc41a00p1 -> ../dm-5
   

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   This means that 3600d0230003414f30000203a7bc41a00 is mapped to two mpath links: dm-4 and dm-5.
3. Next, open /etc/lvm/cache/.cache. Delete all lines containing stale-logical-unit and the mpath links that stale-logical-unit maps to.
   Using the same example in the previous step, the lines you need to delete are:

   /dev/dm-4 
   /dev/dm-5 
   /dev/mapper/3600d0230003414f30000203a7bc41a00
   /dev/mapper/3600d0230003414f30000203a7bc41a00p1
   /dev/mpath/3600d0230003414f30000203a7bc41a00
   /dev/mpath/3600d0230003414f30000203a7bc41a00p1
   

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